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Abstract

We report the results of our studies on the selection of the quantum path in high-harmonic generation (HHG) with a relative-phase-locked two-color laser field. It is shown that by tuning the relative phase between fundamental and second-harmonic fields, The timing of tunnel ionization and subsequent electron trajectories on the sub-cycle time scale can be controlled. We have clearly observed a phase-dependent two-step feature in the harmonic spectra that can be attributed to the selection of two major trajectories in the two-color field HHG.

Figures (5)

(a). Electron trajectories in a monochromatic field. (b). Electron trajectories in a bichromatic field. Black and blue lines show the kinetic energy of a return electron as a function of ionization and recombination times. Solid and dotted lines represent a short and a long trajectories of each branch, respectively. A red line shows an electric field. The amplitude ratio of the SH and fundamental (ESH/Ef) is 0.25 as in the experiment. X-axis is plotted in units of a fundamental (800 nm) light period.

Relative-phase dependent electron trajectories with the relative phase of 0.3π (a), 0.5π (b), and 0.8π rad. (c). Black and blue lines (solid line: short trajectory, dotted line: long trajectory) represent the kinetic energy of a return electron as a function of ionization and recombination times in units of fundamental (800-nm) light periods, respectively. A red line shows a two-color field.